$129 Find Cheap Flights from Ontario to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 4/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$195
Overall average: $421
WestJet
Fri 5/15Sat 5/23
YOW - SEA • 1 stop
Cheapest non-stop
$236
Typical prices: $252-$685
Alaska Airlines
Thu 1/8Sun 1/18
YYZ - SEA • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Ontario to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Seattle

Fri, May 15 - Sat, May 23
WestJet Logo
3:45 pm - 8:28 pmYOW-SEA
7h 43m1 stop
WestJet Logo
7:05 am - 6:25 pmSEA-YOW
8h 20m1 stop
$195WestJet
Find Deal
Fri, May 15 - Sat, May 23
WestJet Logo
3:45 pm - 8:28 pmYOW-SEA
7h 43m1 stop
WestJet Logo
7:05 am - 6:25 pmSEA-YOW
8h 20m1 stop
$196WestJet
Find Deal
Mon, Apr 27 - Sat, May 2
WestJet Logo
6:00 am - 1:08 pmYHM-SEA
10h 08m1 stop
WestJet Logo
2:05 pm - 12:40 amSEA-YHM
7h 35m1 stop
$197WestJet
Find Deal
Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
3:45 pm - 10:59 pmYYZ-SEA
10h 14m1 stop
United Airlines Logo
10:58 am - 9:21 pmSEA-YYZ
7h 23m1 stop
$234United Airlines
Find Deal
Fri, Feb 13 - Sun, Feb 22
Multiple Airlines Logo
4:45 pm - 7:18 pmYYZ-SEA
5h 33mnonstop
Multiple Airlines Logo
6:07 pm - 6:43 amSEA-YYZ
9h 36m1 stop
$235Multiple Airlines
Find Deal
Thu, Jan 8 - Sun, Jan 18
Alaska Airlines Logo
4:45 pm - 7:17 pmYYZ-SEA
5h 32mnonstop
Alaska Airlines Logo
7:55 am - 3:35 pmSEA-YYZ
4h 40mnonstop
$236Alaska Airlines
Find Deal
Fri, Feb 13 - Wed, Feb 18
Air Canada Logo
7:50 pm - 10:16 pmYYZ-SEA
5h 26mnonstop
Air Canada Logo
8:00 pm - 6:49 amSEA-YYZ
7h 49m1 stop
$239Air Canada
Find Deal
Sat, Feb 21 - Sat, Feb 28
United Airlines Logo
6:30 am - 11:30 pmYYZ-SEA
20h 00m1 stop
United Airlines Logo
11:59 pm - 2:01 pmSEA-YYZ
11h 02m1 stop
$240United Airlines
Find Deal
Tue, Jan 20 - Wed, Jan 21
Air Canada Logo
5:40 pm - 10:16 pmYXU-SEA
7h 36m1 stop
Air Canada Logo
8:00 pm - 8:46 amSEA-YXU
9h 46m2 stops
$240Air Canada
Find Deal
Thu, Jan 15 - Wed, Jan 21
Multiple Airlines Logo
9:20 am - 6:22 pmYTZ-SEA
12h 02m1 stop
Multiple Airlines Logo
11:05 pm - 5:43 pmSEA-YTZ
15h 38m2 stops
$301Multiple Airlines
Find Deal
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$129
Best time to beat the crowds with an average 17% drop in price.
Flight from Montreal to Seattle

FAQs for booking flights from Ontario to Seattle

  • How does KAYAK find such low prices on flights from Ontario to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Westport
Lakewood
Mukilteo
Lacey
Poulsbo
Edmonds
Aberdeen
Woodinville
Shoreline
DuPont
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)